Magneto call-box



(No Model.) 2'Sheets-Sheet l J. F KETTELL.

MAGNETO CALL BOX. N0. 3 Patented Dec. 1, 1885.

n. PETERS. Fhaloulhagraphur, Wnhilvgtan. n. a

(No Model.) 2 Sheets-Sheet 2. J. F. KETTELL.

MAGNETO CALL BOX.

No. 331,718. Patented Dec. 1, 1885.

m e v .n I

N. PETnS, PhoQb-Lvthognpbar. Wnhingmn. 0.1;

JAMES F. HE QIELL Application filed January 31, 1885.

To all ZUhONt it may concern.-

Be it known that l, Jiuins F. KETTELL, citizen of the United States, residing at \YOl'CGS ter, in the county of \Vorccster and State of Massachusetts, have invented certain new and useful Improvements in Itiagnete Call-Boxes; and I do d cclare the followin tolie a full, clear, and exactdescription oi the invention, such as will enahle others skilled in the art to which it appcrtnins to make and use the same, refer enee being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a; part of this specification.

Figure 1 represents a front elevationof a magneto call-box to which my improvements have been applied. Fig. 2 is a side View the same, partly broken away.

The present improvement relates to electric signals; and the invention consists in the following arrangement and cons ion of the operating parts, which will first he fully described, and the points of novelty then indicated in the claims.

Referring to the drawings, A is the box for containing the principal mechanism.

B is the DlQtgllCi'O-ClBClllC machine, of the usual construction.

G is the grooved pulley on the revolving arniatnreshaft.

1') is the drive-pulley, which rotates the grooved pulley by frictional contact.

is the hand-crank, keyed to the same shaft as the drive-pulley.

F is a spring lock-lever, which normally engages a pin on the crank E, and holds it in place against unauthorized use or manipulation by those ignorant of how to use it. This lever is limited in its throw by two nins, G G. Its fulcrum is at H, and the spring 1' has a constant tendency to throw the outer end of the lever upwardly.

K represents a train of gears of any design, driven by a spring. It is arranged to c rry one or more "toothed disks-snch 5.. L leiupon a revolving arbor.

N is a d'sk (shown 1n dott d lines) he vi ng a single notch and mounted upon the arbor which carries the toothed disks.

0 is a rock-lever, one end of which normally rests Within the notch in the disk l by d ep res and holds the train of gears at rest.

WOlltlEfSTml?, MASACHUSETTS GALL EOX.

$13, dated December 1, 1885.

Serial 230. 153,519. (No model.)

P is a earn arranged upon the drive-pulley D. The right-hand end of the rock-lever O is arranged to lie in the path of the earn 1? when the pulley D is rotated, and lifts it, there sing the catch at the other end from the notch in disk N. The toothed disks L M and the disk N then make one full revolution, and the lever, through its retractile spring, enters the notch in disk as it completes its rotation and again stops the train.

The teeth orlixed electrodes upon the disks L 3.1 Will be described further on.

is a metallic post, which carries a yielding wiping-electrode, it, preferahly fixed.

l? is a Wiping eontaetspring arranged to lie against the armature-axis in electrical corninnnieation.

is a wire connecting post Qand spring R. Electrode 2 is arranged to contact disk L.

U is an electrode aranged to operate in conjunction with disk M. This electrode U is adjustable, and is adapted to be p esented or withdrawn from contact with the electrodes 'ied by oisk For this purpose it may rranged after the manner of a common electrical switch or circuit-maker.

V is a pin mounted upon one of the electrode-carrying disks, and lies in the path of 80 the hellhan'nner lever \V and serves to operate it.

I; is a galvanonieter comprising a simple magnetic poised needle having an adjacent coil, Y, located in the main line, which, when energized, serves to deflect the needle.

Z is an arm keyed last to the crank-shaft.

a. Z) are two pins secured in the drive-pulley D, the former of which is metallic and the latter insulated, Fig. 2.

c is a retract-lie spring, which holds the metallic arm normally in contact with the metal pin a. The drivepulley D is loose upon the crankshaft. When the magneto call is at rest, a short circuit is established through the 1]1ttg1ll' );i)tlh\Ylltfll the call is operated the short circuit is broken by the arm Z leaving the metal pin a and abutting against insulated pin Z), there being no elec trieal connection between drive-pulley D and arm Z, except through contact with the metal in a.

When the call is in a quiescent state, the condition of the line and apparatus is as follows: One end of the line enters the box (either from the ground or a return wire) at binding-"post 5. The wirel is attached to this post andterminates at the metal frame of the gear-train K, with which it is electrically connected. A branch wire,2, islooped into wire 1, and connects with the crank-shaft of the magneto-call. The pulley D being insulated from the crank-shaft and from the arm Z, the electrical path is from the shaft to the arm Z, thence to pin a, (see Fig. 2,) pulley D, and through the magneto. .From the magneto wire 3 leads direct to binding post 6, to which the line-wire is attached, passing through the galvanometer X. This short circuit through the magneto is always estab lished, except when it is desired to use the box for making a call or signal. WVhen a signal is made from the magneto, the crank is turned and a current generated upon theline. Immediately upon the turningof the crank the arm Z, moving with the crank, leaves its contact with metal pin a and abuts against the insulated pin [2, thereby breaking the short circuit through line-branch 2, as before described. During the further revolution of the loose pulley D (which is driven through the contact of the arm Z with the pin 1)) the cam P comes in contact with lever O and depresses the catch from the notch in disk N, allowing the train K and its electrode-disks L and M to make one full revolution and stop. The moment the electrode 0 of disk L comes in contact with the spring-electrode T the broken current generated by the magneto is momentarily made during the wiping contact of the two electrodes, the current pass ing from line 1 to the train K, through electrodes c and T, through post Q, line 4, wipingspring It, to the magneto, and out from the latter by line 3 to the line-wire, and recording a signal at the central office. The current is broken until the two teeth electrodes d are brought in contact with electrode T, and a double signal is recorded in precisely the same manner, after which the group of four electrodes, 6, come into electrical contact, and afterward the group of seven electrodes, f. Electrode 0 sends an attention-signal, and the successive groups 2 4t 7 of electrodes signal the number of the call-box, which in this instance is No. 247. During the revolution the pinVsounds the bell, which announces to the subscriber that the call is finished. The spaces between the groups of electrodes 0, d, e, and f are greater than the spaces be tween the electrodes comprising a group.

In aportion of the circumference of the disk M are three electrodes, 9, which are arranged to come in contact with a switch-electrode, U,-and in a predetermined mode of signals may convey any desired meaningsuch as a call for a cab, fire, police, messenger, and the like. It will be understood that there is a separate disk with suitable electrodes and a switch for each call desired. These disks are all mounted on the same shaft, and a common switchboard is used, all of which will readily suggest themselves.

The different magnetos maybe operated by any power other than hand. I contemplate actuating them by spring-power. The signals received by the central office are made by taps on a bell,or recorded in a registeringmachine, as -in telegraphing, or in any other of the well-known methods. The magneto of each box is continuously operated until the bell on the boX is sounded, which is a signal that the call is completed. In recording the calls in a register at the central office such a system will require a relay and a local battery on the recorder for increasing the sound. It will be seen that almost any number of subscribers boxes may be arranged in one circuit, as the circuit is an open one, and the only resistance is a slight one in the coil of each galvanometer X. As the currents are generated by the magneto, there is no expensive battery to be maintained on the line. The call of any one subscriber may work all the galvanometers, thereby showing that the line is in use and preventing any interference. A battery-current sent from central office will vibrate a subscribefls galvanometer, showing that a call is requested from him.

I claim- 1. A current-generator, a driving-shaft for imparting motion to the generator, a circuit making or breaking wheel electrically connected with the line, a mechanical power for driving the circuit-wheel, a stop device for arresting the movement of the circuit-wheel at each full revolution, and a projection carried by the said drivingshaft for actuating the stop device and releasing the circuit-wheel upon the revolution of the shaft and the energizing of the current-generator, the whole constructed to act in combination, substantially as set forth.

2. A current-generator, a driving-shaft for imparting motion thereto, a circuit making or breaking wheel, a mechanical power for driving the circuit-wheel, astop device for arresting the movement of the circuit-wheel at each full revolution, a shunt in which the circuit-wheel is located, and means, substantially as described, carried by the driving shaft, for breaking the shunt-circuit and releasing the said stop device upon the revolution of the shaft and energizing of the generator, all in combination, as set forth.

3. A series of magneto call-boxes, each comprising a magneto-generator, an open circuit in connection therewith, a self-impelled train of gears, a circuit-piece rotated by the gears, and a shunt normally short-circuiting the circuit-piece, and means for breaking and restoring the shunt and rotating and stopping the circuit-piece upon the energizing of the magneto, all in combination.

4. A cui'rentgenerator, a driving-shaft for imparting motion to the generator, a circuitwheel and a mechanical power for driving said wheel, a stop device for arresting the movement of the circuit-wheel at each full revolution, a gnlvnnometer in electrical conmachine, a projection carried thereby, and a nection with the line, a shunt for normally shorteireuiting the circuit-Wheel, and projections carried by the driving-shaft for breaking the shunt and actuating the stop which releases the circuit-wheel upon the revolution of the shaft and energizing ofthe current-gen erator, the whole constructed to act in combination, substantially as specified.

5. The driving-Shaft of a magneto-electric pivoted spring iOfikillg-ilfln adapted normally to receive and hold the said projection, all in combination, as set forth.

In testimony whereof I affix my signature in [5 presence of two witnesses.

JAMES R KETTELL. Witnesses:

WILLIAM N. Itrronrn, HnncULn F. NORMAN'D. 

